Messages in this thread Patch in this message | | | Date | Thu, 4 Feb 2016 16:14:38 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH v8] kernel: add kcov code coverage |
| |
On Thu, 4 Feb 2016 16:40:41 +0100 Dmitry Vyukov <dvyukov@google.com> wrote:
> kcov provides code coverage collection for coverage-guided fuzzing > (randomized testing).
# make allmodconfig # make Makefile:679: Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler scripts/kconfig/conf --silentoldconfig Kconfig Makefile:679: Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CC arch/x86/purgatory/purgatory.o gcc: error: unrecognized command line option '-fsanitize-coverage=trace-pc' make[1]: *** [arch/x86/purgatory/purgatory.o] Error 1 make: *** [archprepare] Error 2
We can't break allmodconfig and allyesconfig!
I did this:
--- a/Makefile~kernel-add-kcov-code-coverage-fix-2 +++ a/Makefile @@ -678,6 +678,7 @@ ifdef CONFIG_KCOV ifeq ($(call cc-option, $(CFLAGS_KCOV)),) $(warning Cannot use CONFIG_KCOV: \ -fsanitize-coverage=trace-pc is not supported by compiler) + CFLAGS_KCOV = endif endif but hopefully there's a better way: it's a bit silly to build in the kcov code but to not have the compiler-generated instrumentation which calls it.
| |